/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.sql.impl.rule;



import com.bff.gaia.unified.sdk.extensions.sql.impl.rel.UnifiedCalcRel;

import com.bff.gaia.unified.sdk.extensions.sql.impl.rel.UnifiedLogicalConvention;

import org.apache.calcite.plan.Convention;

import org.apache.calcite.plan.RelOptRule;

import org.apache.calcite.plan.RelOptRuleCall;

import org.apache.calcite.rel.RelNode;

import org.apache.calcite.rel.convert.ConverterRule;

import org.apache.calcite.rel.core.Calc;

import org.apache.calcite.rel.logical.LogicalCalc;



/** A {@code ConverterRule} to replace {@link Calc} with {@link UnifiedCalcRel}. */

public class UnifiedCalcRule extends ConverterRule {

  public static final UnifiedCalcRule INSTANCE = new UnifiedCalcRule();



  private UnifiedCalcRule() {

    super(LogicalCalc.class, Convention.NONE, UnifiedLogicalConvention.INSTANCE, "UnifiedCalcRule");

  }



  @Override

  public boolean matches(RelOptRuleCall x) {

    return true;

  }



  @Override

  public RelNode convert(RelNode rel) {

    final Calc calc = (Calc) rel;

    final RelNode input = calc.getInput();



    return new UnifiedCalcRel(

        calc.getCluster(),

        calc.getTraitSet().replace(UnifiedLogicalConvention.INSTANCE),

        RelOptRule.convert(input, input.getTraitSet().replace(UnifiedLogicalConvention.INSTANCE)),

        calc.getProgram());

  }

}